Mercurial > hg > truffle
comparison src/cpu/x86/vm/compiledIC_x86.cpp @ 10168:a6e09d6dd8e5
8003853: specify offset of IC load in java_to_interp stub
Summary: refactored code to allow platform-specific differences
Reviewed-by: dlong, twisti
Contributed-by: Goetz Lindenmaier <goetz.lindenmaier@sap.com>
author | dlong |
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date | Wed, 24 Apr 2013 20:55:28 -0400 |
parents | |
children | 36bcc10e01c0 78bbf4d43a14 |
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10106:42a42da29fd7 | 10168:a6e09d6dd8e5 |
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1 /* | |
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "asm/macroAssembler.inline.hpp" | |
27 #include "code/compiledIC.hpp" | |
28 #include "code/icBuffer.hpp" | |
29 #include "code/nmethod.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "runtime/mutexLocker.hpp" | |
32 #include "runtime/safepoint.hpp" | |
33 | |
34 // Release the CompiledICHolder* associated with this call site is there is one. | |
35 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { | |
36 // This call site might have become stale so inspect it carefully. | |
37 NativeCall* call = nativeCall_at(call_site->addr()); | |
38 if (is_icholder_entry(call->destination())) { | |
39 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); | |
40 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); | |
41 } | |
42 } | |
43 | |
44 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { | |
45 // This call site might have become stale so inspect it carefully. | |
46 NativeCall* call = nativeCall_at(call_site->addr()); | |
47 return is_icholder_entry(call->destination()); | |
48 } | |
49 | |
50 //----------------------------------------------------------------------------- | |
51 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
52 | |
53 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) | |
54 : _ic_call(call) | |
55 { | |
56 address ic_call = call->instruction_address(); | |
57 | |
58 assert(ic_call != NULL, "ic_call address must be set"); | |
59 assert(nm != NULL, "must pass nmethod"); | |
60 assert(nm->contains(ic_call), "must be in nmethod"); | |
61 | |
62 // Search for the ic_call at the given address. | |
63 RelocIterator iter(nm, ic_call, ic_call+1); | |
64 bool ret = iter.next(); | |
65 assert(ret == true, "relocInfo must exist at this address"); | |
66 assert(iter.addr() == ic_call, "must find ic_call"); | |
67 if (iter.type() == relocInfo::virtual_call_type) { | |
68 virtual_call_Relocation* r = iter.virtual_call_reloc(); | |
69 _is_optimized = false; | |
70 _value = nativeMovConstReg_at(r->cached_value()); | |
71 } else { | |
72 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); | |
73 _is_optimized = true; | |
74 _value = NULL; | |
75 } | |
76 } | |
77 | |
78 // ---------------------------------------------------------------------------- | |
79 | |
80 #define __ _masm. | |
81 void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) { | |
82 // Stub is fixed up when the corresponding call is converted from | |
83 // calling compiled code to calling interpreted code. | |
84 // movq rbx, 0 | |
85 // jmp -5 # to self | |
86 | |
87 address mark = cbuf.insts_mark(); // Get mark within main instrs section. | |
88 | |
89 // Note that the code buffer's insts_mark is always relative to insts. | |
90 // That's why we must use the macroassembler to generate a stub. | |
91 MacroAssembler _masm(&cbuf); | |
92 | |
93 address base = | |
94 __ start_a_stub(to_interp_stub_size()*2); | |
95 if (base == NULL) return; // CodeBuffer::expand failed. | |
96 // Static stub relocation stores the instruction address of the call. | |
97 __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand); | |
98 // Static stub relocation also tags the Method* in the code-stream. | |
99 __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time. | |
100 // This is recognized as unresolved by relocs/nativeinst/ic code. | |
101 __ jump(RuntimeAddress(__ pc())); | |
102 | |
103 // Update current stubs pointer and restore insts_end. | |
104 __ end_a_stub(); | |
105 } | |
106 #undef __ | |
107 | |
108 int CompiledStaticCall::to_interp_stub_size() { | |
109 return NOT_LP64(10) // movl; jmp | |
110 LP64_ONLY(15); // movq (1+1+8); jmp (1+4) | |
111 } | |
112 | |
113 // Relocation entries for call stub, compiled java to interpreter. | |
114 int CompiledStaticCall::reloc_to_interp_stub() { | |
115 return 4; // 3 in emit_to_interp_stub + 1 in emit_call | |
116 } | |
117 | |
118 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { | |
119 address stub = find_stub(); | |
120 guarantee(stub != NULL, "stub not found"); | |
121 | |
122 if (TraceICs) { | |
123 ResourceMark rm; | |
124 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", | |
125 instruction_address(), | |
126 callee->name_and_sig_as_C_string()); | |
127 } | |
128 | |
129 // Creation also verifies the object. | |
130 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); | |
131 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
132 | |
133 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), | |
134 "a) MT-unsafe modification of inline cache"); | |
135 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, | |
136 "b) MT-unsafe modification of inline cache"); | |
137 | |
138 // Update stub. | |
139 method_holder->set_data((intptr_t)callee()); | |
140 jump->set_jump_destination(entry); | |
141 | |
142 // Update jump to call. | |
143 set_destination_mt_safe(stub); | |
144 } | |
145 | |
146 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { | |
147 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
148 // Reset stub. | |
149 address stub = static_stub->addr(); | |
150 assert(stub != NULL, "stub not found"); | |
151 // Creation also verifies the object. | |
152 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); | |
153 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
154 method_holder->set_data(0); | |
155 jump->set_jump_destination((address)-1); | |
156 } | |
157 | |
158 //----------------------------------------------------------------------------- | |
159 // Non-product mode code | |
160 #ifndef PRODUCT | |
161 | |
162 void CompiledStaticCall::verify() { | |
163 // Verify call. | |
164 NativeCall::verify(); | |
165 if (os::is_MP()) { | |
166 verify_alignment(); | |
167 } | |
168 | |
169 // Verify stub. | |
170 address stub = find_stub(); | |
171 assert(stub != NULL, "no stub found for static call"); | |
172 // Creation also verifies the object. | |
173 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); | |
174 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
175 | |
176 // Verify state. | |
177 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
178 } | |
179 | |
180 #endif // !PRODUCT |